As shares of Apple (AAPL) stock continued to soar on Monday, Apple achieved what is perhaps one of its most impressive feats to date. The company’s market capitalization sailed past $620 billion Monday morning, making Apple the most valuable company in history. The title was previously held by Microsoft (MSFT), which saw its market cap hit nearly $619 billion in late 1999. As noted by MacRumors, however, Microsoft’s record value in late 1999 balloons to $842.5 billion when accounting for inflation. Apple’s stock continues to climb to new heights as anticipation grows ahead of what every Apple analyst on the planet sees as Apple’s biggest-ever product launch, the upcoming sixth-generation iPhone. Rumors that Apple’s “iPad mini” and its upcoming own-brand HDTV are already being built in Chinese factories also helped send Apple investors into a frenzy on Friday, pushing the company’s share price to an all-time high that has since been topped during Monday’s trading session.